RE: st: duplicating observations

You might like to try the -expgen- command, which is an extended version
of -expand- downloadable from SSC, which sorts the dataset so that the
duplicates of each observation are side by side, and can optionally add
a new variable giving the sequence number of each duplicate within the
set of duplicates for the same observation. In Stata, use the -ssc-
command to download -expgen-.
I hope this helps.
Roger
Roger Newson
Lecturer in Medical Statistics
POSTAL ADDRESS:
Respiratory Epidemiology and Public Health Group
National Heart and Lung Institute at Imperial College London
St Mary's Campus
Norfolk Place
London W2 1PG
STREET ADDRESS:
Respiratory Epidemiology and Public Health Group
National Heart and Lung Institute at Imperial College London
47 Praed Street
Paddington
London W1 1NR
TELEPHONE: (+44) 020 7594 0939
FAX: (+44) 020 7594 0942
EMAIL: r.newson@imperial.ac.uk
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Opinions expressed are those of the author, not of the institution.
-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of SamL
Sent: 26 April 2006 15:43
To: statalist@hsphsun2.harvard.edu
Cc: SamL@demog.berkeley.edu
Subject: Re: st: duplicating observations
As some have said, you can use the -expand- command. If you only need
to
expand so you can estimate models, many models allow frequency weights,
which basically do the expansion on-the-fly during estimation.
Hope this helps.
Sam
On Wed, 26 Apr 2006, louis boakye-yiadom wrote:
> Dear All,
> Is there a Stata command for duplicating observations? I have a
summarised
> dataset, in the sense that it is in a "frequency table" format, but
I'm
> interested in converting it into individual level observations. So I
reckon
> if there is a way of asking Stata to generate multiple copies of an
> observation, I would be able to have the data in the desired format.
Any
> help will be appreciated. Thanks.
>
> Louis
>
>
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